1. How many seconds are there in one year? Physicists and astronomers like to approximate the
number of seconds in a year as x 10 7 s. What is the percent error (approximate value real value)/
(real value) x 100%?
Phys 131 Fall 2014
1. Two cars are driving at highway speeds (65 mph), when the car in front suddenly brakes (a = —6.2
m/sz). The car in the rear is following at a distance of 20m, and is capable of a breaking
deceleration of 5.6 m/sz. Tak